/**
 * iBox 2.18 (Build 1576)
 * For more info & download: http://www.ibegin.com/labs/ibox/
 * Created as a part of the iBegin Labs Project - http://www.ibegin.com/labs/
 * For licensing please see readme.html (MIT Open Source License)
*/
var iBox = function() {
  var _pub = {
    // label for the close link
    close_label: 'Close',

    // show iframed content in the parent window
    // this *does not* work with #containers
    inherit_frames: false,

    // how fast to fade in the overlay/ibox (this is each step in ms)
    fade_in_speed: 300,
    fade_out_speed: 300,

    // our attribute identifier for our iBox elements
    attribute_name: 'rel',
    
    // tags to hide when we show our box
    tags_to_hide: ['select', 'embed', 'object'],

    // default width of the box (when displaying html only)
    // height is calculated automatically
    default_width: 450,

    // public version number
    version_number: '2.18',
    // internal build number
    build_number: '1576',

    // browser checks    
    is_opera: navigator.userAgent.indexOf('Opera/9') != -1,
    is_ie: navigator.userAgent.indexOf("MSIE ") != -1,
    is_ie6: false /*@cc_on || @_jscript_version < 5.7 @*/,
    is_firefox: navigator.appName == "Netscape" && navigator.userAgent.indexOf("Gecko") != -1 && navigator.userAgent.indexOf("Netscape") == -1,
    is_mac: navigator.userAgent.indexOf('Macintosh') != -1,

    // url for including images/external files
    base_url: '',
    
    /**
     * Updates the base_url variable.
     * @param {String} path Relative or absolute path to this file.
     */
    setPath: function(path) {
      _pub.base_url = path;
    },
    
    /**
     * Checks a container for specified tags containing rel="ibox"
     * @param {Object} container
     * @param {String} tag_name
     */
    checkTags: function(container, tag_name) {
      if (!container) var container = document.body;
      if (!tag_name) var tag_name = 'a';
      var els = container.getElementsByTagName(tag_name);
      for (var i=0; i<els.length; i++) {
        if (els[i].getAttribute(_pub.attribute_name)) {
          var t = els[i].getAttribute(_pub.attribute_name);
          if ((t.indexOf("ibox") != -1) || t.toLowerCase() == "ibox") { // check if this element is an iBox element
            els[i].onclick = _pub.handleTag;
          }
        }
      }
    },
    
    /**
     * Binds arguments to a callback function
     */
    bind: function(fn) {
        var args = [];
        for (var n=1; n<arguments.length; n++) args.push(arguments[n]);
        return function(e) { return fn.apply(this, [e].concat(args)); };
    },

    /**
     * Sets the content of the ibox
     * @param {String} content HTML content
     * @param {Object} params
     */
    html: function(content, params) {
      if (content === undefined) return els.content;
      if (params === undefined) var params = {};
      if (!active.is_loaded) return;
      _pub.clear();

      _pub.updateObject(els.wrapper.style, {display: 'block', visibility: 'hidden', left: 0, top: 0, height: '', width: ''});
      
      if (typeof(content) == 'string') els.content.innerHTML = content;
      else els.content.appendChild(content);

      var pagesize = _pub.getPageSize();

      if (params.can_resize === undefined) params.can_resize = true;
      if (params.fade_in === undefined) params.use_fade = true;

      if (params.fullscreen) {
        params.width = '100%';
        params.height = '100%';
      }
      
      // reset offsets
      offset.container = [els.wrapper.offsetLeft*2, els.wrapper.offsetTop*2];
      offset.wrapper = [els.wrapper.offsetWidth-els.content.offsetWidth, els.wrapper.offsetHeight-els.content.offsetHeight];

      // TODO: remove the +4 when issue is solved with calculations
      offset.wrapper[1] += 4;

      if (params.width) var width = params.width;
      else var width = _pub.default_width;

      if (params.height) var height = params.height;
      else {
        els.content.style.height = '100%';
        var height = els.content.offsetHeight + 12;
        els.content.style.height = '';
      }
      active.dimensions = [width, height];
      active.params = params;
      _pub.reposition();

      // XXX: Fix for inline containers which had elements that were hidden
      for (var i=0; i<_pub.tags_to_hide.length; i++) {
        showTags(_pub.tags_to_hide[i], els.content);
      }

      els.wrapper.style.visibility = 'visible';
    },
    
    /**
     * Empties the content of the iBox (also hides the loading indicator)
     */
    clear: function() {
      els.loading.style.display = "none";
      while (els.content.firstChild) els.content.removeChild(els.content.firstChild);
    },
    
    /**
     * Loads text into the ibox
     * @param {String} url
     * @param {String} title
     * @param {Object} params
     */
    show: function(text, title, params) {
      showInit(title, params, function() {
        _pub.html(text, active.params);
      });
    },
    /**
     * Loads a url into the ibox
     * @param {String} url
     * @param {String} title
     * @param {Object} params
     */
    showURL: function(url, title, params) {
      showInit(title, params, function() {
        for (var i=0; i<_pub.plugins.list.length; i++) {
          var plugin = _pub.plugins.list[i];
          if (plugin.match(url)) {
            active.plugin = plugin;
            plugin.render(url, active.params);
            break;
          }
        }
      });
    },

    /**
     * Hides the iBox
     */
    hide: function() {
      if (active.plugin) {
        // call the plugins unload method
        if (active.plugin.unload) active.plugin.unload();
      }
      active = {}
      _pub.clear();
      // restore elements that were hidden
      for (var i=0; i<_pub.tags_to_hide.length; i++) showTags(_pub.tags_to_hide[i]);

      els.loading.style.display = 'none';
      els.wrapper.style.display = 'none';
      _pub.fade(els.overlay, _pub.getOpacity(null, els.overlay), 0, _pub.fade_out_speed, function() { els.overlay.style.display = 'none';});
      _pub.fireEvent('hide');
    },

    /**
     * Repositions the iBox wrapper based on the params set originally.
     */
    reposition: function() {
      if (!active.is_loaded) return;

      // center loading box
      if (els.loading.style.display != 'none') _pub.center(els.loading);
      
      // update ibox width/height/position
      if (active.dimensions) {
        var pagesize = _pub.getPageSize();

        var width = active.dimensions[0];
        var height = active.dimensions[1];
        
        if (height.toString().indexOf('%') != -1) {
          els.wrapper.style.height = (Math.max(document.documentElement.clientHeight, document.body.clientHeight, pagesize.height) - offset.container[0])*(parseInt(height)/100) + 'px';
        }
        else if (height) {
          els.content.style.height = height + 'px';
          // TODO: if we dont set wrapper height, it doesnt restrict the height and the box is fine
          // so offset.wrapper[1] must not be correct
          els.wrapper.style.height = els.content.offsetHeight + offset.wrapper[1] + 'px';
        }
        else {
          els.wrapper.style.height = els.content.offsetHeight + offset.wrapper[1] + 'px';
        }
        var container_offset = (els.content.offsetHeight - els.content.firstChild.offsetHeight);
        if (width.toString().indexOf('%') != -1) {
          els.wrapper.style.width = (Math.max(document.documentElement.clientWidth, document.body.clientWidth, pagesize.width) - offset.container[1])*(parseInt(width)/100) + 'px';
          var container_offset = 0;
        }
        else {
          els.content.style.width = width + 'px';
          els.wrapper.style.width = els.content.offsetWidth + offset.wrapper[0] + 'px';
        }

        _pub.updateObject(els.content.style, {width: '', height: ''});

        var width = parseInt(els.wrapper.style.width);
        var height = parseInt(els.wrapper.style.height);

        // if we can resize this, make sure it fits in our page bounds
        if (active.params.can_resize) {
          var x = pagesize.width;
          var y = pagesize.height;
          
          x -= offset.container[0];
          y -= offset.container[1];
          if (width > x) {
            if (active.params.constrain) height = height * (x/width);
            width = x;
          }
          if (height > y) {
            if (active.params.constrain) width = width * (y/height);
            height = y;
          }
          _pub.updateObject(els.wrapper.style, {width: width + 'px', height: height + 'px'});
        }

        //els.content.style.width = width - offset.wrapper[0] + 'px';
        // TODO: this isn't adjusting to the right height for containers that are smaller than the page height
        // resize the wrappers height based on the content boxes height
        // this needs to be height - ibox_content[margin+padding+border]
        els.content.style.height = height - offset.wrapper[1] + 'px';
        if (active.dimensions != ['100%', '100%']) _pub.center(els.wrapper);
      }
      
      // fix overlay width/height (cant use css fixed on ie6 or fx or any
      // browser really due to issues)
      els.overlay.style.height = Math.max(document.body.clientHeight, document.documentElement.clientHeight) + 'px';
    },

    updateObject: function(obj, params) {
      for (var i in params) obj[i] = params[i];
    },

    /**
     * Centers an object
     * @param {Object} obj
     */
    center: function(obj) {
      var pageSize = _pub.getPageSize();
      var scrollPos = _pub.getScrollPos();
      var emSize = _pub.getElementSize(obj);
      var x = Math.round((pageSize.width - emSize.width) / 2 + scrollPos.scrollX);
      var y = Math.round((pageSize.height - emSize.height) / 2 + scrollPos.scrollY);
      if (obj.offsetLeft) x -= obj.offsetLeft;
      if (obj.offsetTop) y -= obj.offsetTop;
      if (obj.style.left) x += parseInt(obj.style.left);
      if (obj.style.top) y += parseInt(obj.style.top);
      // this nearly centers it due to scrollbars
      x -= 10;
      _pub.updateObject(obj.style, {top: y + 'px', left: x + 'px'});
    },
    
    getStyle: function(obj, styleProp) {
      if (obj.currentStyle)
        return obj.currentStyle[styleProp];
      else if (window.getComputedStyle)
        return document.defaultView.getComputedStyle(obj,null).getPropertyValue(styleProp);
    },

    /**
     * Gets the scroll positions
     */
    getScrollPos: function() {
      var docElem = document.documentElement;
      return {
        scrollX: document.body.scrollLeft || window.pageXOffset || (docElem && docElem.scrollLeft),
        scrollY: document.body.scrollTop || window.pageYOffset || (docElem && docElem.scrollTop)
      };
    },

    /**
     * Gets the page constraints
     */
    getPageSize: function() {
      return {
        width: window.innerWidth || (document.documentElement && document.documentElement.clientWidth) || document.body.clientWidth,
        height: window.innerHeight || (document.documentElement && document.documentElement.clientHeight) || document.body.clientHeight
      };
    },

    /**
     * Gets an objects offsets
     * @param {Object} obj
     */
    getElementSize: function(obj) {
      return {
        width: obj.offsetWidth || obj.style.pixelWidth,
        height: obj.offsetHeight || obj.style.pixelHeight
      };
    },
    
    fade: function(obj, start, end, speed, callback) {
      if (start === undefined || !(start >= 0) || !(start <= 100)) var start = 0;
      if (end === undefined || !(end >= 0) || !(end <= 100)) var end = 100;
      if (speed === undefined) var speed = 0;

      if (obj.fader) clearInterval(obj.fader);

      if (!speed) {
        _pub.setOpacity(null, obj, end);
        if (callback) callback();
      }
      
      var opacity_difference = end - start; 
      var time_total = speed; // time is speed (jQuery compat)
      var step_size = 25; // step size in ms
      var steps = time_total / step_size; // total number of steps
      var increment = Math.ceil(opacity_difference / steps); // how much to incr per step
      
      obj.fader = setInterval(_pub.bind(function(e, obj, increment, end, callback) {
        var opacity = _pub.getOpacity(e, obj) + increment;
        _pub.setOpacity(e, obj, opacity);
        if ((increment < 0 && opacity <= end) || (increment > 0 && opacity >= end)) {
          _pub.setOpacity(e, obj, end);
          clearInterval(obj.fader);
          if (callback) callback();
        }
      }, obj, increment, end, callback), step_size);
    },

    /**
     * Sets the opacity of an element
     * @param {Object} obj
     * @param {Integer} value
     */
    setOpacity: function(e, obj, value) {
      value = Math.round(value);
      obj.style.opacity = value/100;
      obj.style.filter = 'alpha(opacity=' + value + ')';
    },
    
    /**
     * Gets the opacity of an element
     * @param {Object} obj
     * @return {Integer} value
     */
    getOpacity: function(e, obj) {
      return _pub.getStyle(obj, 'opacity')*100;
    },
    
    /**
     * Creates a new XMLHttpRequest object based on browser
     */
    createXMLHttpRequest: function() {
      var http;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http = new XMLHttpRequest();
        if (http.overrideMimeType) {
          // set type accordingly to anticipated content type
          http.overrideMimeType('text/html');
        }
      }
      else if (window.ActiveXObject) { // IE
        try {
          http = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
          try {
            http = new ActiveXObject("Microsoft.XMLHTTP");
          } catch (e) {}
        }
      }
      if (!http) {
        alert('Cannot create XMLHTTP instance');
        return false;
      }
      return http;
    },
    
    addEvent: function(obj, evType, fn) {
      if (obj.addEventListener) {
        obj.addEventListener(evType, fn, false);
        return true;
      }
      else if (obj.attachEvent) {
        var r = obj.attachEvent("on"+evType, fn);
        return r;
      }
      else {
        return false;
      }
    },
    
    addEventListener: function(name, callback) {
      if (!events[name]) events[name] = new Array();
      events[name].push(callback);
    },
    
    /**
     * Causes all event listeners attached to `name` event to
     * execute.
     * @param {String} name Event name
     */
    fireEvent: function(name) {
        if (events[name] && events[name].length) {
          for (var i=0; i<events[name].length; i++) {
            var args = [];
            for (var n=1; n<arguments.length; n++) args.push(arguments[n]);
            // Events returning false stop propagation
            if (events[name][i](args) === false) break;
          }
        }
    },
    
    /**
     * Parses the arguments in the rel attribute
     * @param {String} query
     */
    parseQuery: function(query) {
       var params = new Object();
       if (!query) return params; 
       var pairs = query.split(/[;&]/);
       var end_token;
       for (var i=0; i<pairs.length; i++) {
          var keyval = pairs[i].split('=');
          if (!keyval || keyval.length != 2) continue;
          var key = unescape(keyval[0]);
          var val = unescape(keyval[1]);
          val = val.replace(/\+/g, ' ');
          if (val[0] == '"') var token = '"';
          else if (val[0] == "'") var token = "'";
          else var token = null;
          if (token) {
            if (val[val.length-1] != token) {
              do {
                i += 1;
                val += '&'+pairs[i];
              }
              while ((end_token = pairs[i][pairs[i].length-1]) != token)
            }
            val = val.substr(1, val.length-2);
          }
          if (val == 'true') val = true;
          else if (val == 'false') val = false;
          else if (val == 'null') val = null;
          params[key] = val;
       }
       return params;
    },
    /**
     * Handles the onclick event for iBox anchors.
     * @param {Event} e
     */
    handleTag: function(e) {
      var t = this.getAttribute('rel');
      var params = _pub.parseQuery(t.substr(5,999));
      if (params.target) var url = params.target;
      else if (this.target && !params.ignore_target) var url = this.target;
      else var url = this.href;
      var title = this.title;
      if (_pub.inherit_frames && window.parent) window.parent.iBox.showURL(url, title, params);
      else _pub.showURL(url, title, params);
      return false;
    },
    
    plugins: {
      list: new Array(),
      register: function(func, last) {
        if (last === undefined) var last = false;
        if (!last) {
          _pub.plugins.list = [func].concat(_pub.plugins.list);
        }
        else {
          _pub.plugins.list.push(func);
        }
      }
    }
  };
  
  // private methods and variables
  var active = {};
  
  // events
  var events = {};

  // some containers
  // we store these in memory instead of finding them each time
  var els = {};
  
  var offset = {};
  
  /**
   * Creates the iBox container and appends it to an element
   * @param {HTMLObject} elem Container to attach to
   * @return {HTMLObject} iBox element
   */
  var create = function(elem) {
    pagesize = _pub.getPageSize();
    
    // TODO: why isnt this using DOM tools
    // a trick on just creating an ibox wrapper then doing an innerHTML on our root ibox element
    els.container = document.createElement('div');
    els.container.id = 'ibox';

    els.overlay = document.createElement('div');
    els.overlay.style.display = 'none';
    _pub.setOpacity(null, els.overlay, 0);
    // firefox mac has issues with opacity and flash
    if (!_pub.is_firefox) els.overlay.style.background = '#000000';
    else els.overlay.style.backgroundImage = "url('" + _pub.base_url + "images/bg.png')";
    els.overlay.id = 'ibox_overlay';
    params = {position: 'absolute', top: 0, left: 0, width: '100%'};
    _pub.updateObject(els.overlay.style, params);
    els.overlay.onclick = _pub.hide;
    els.container.appendChild(els.overlay);

    els.loading = document.createElement('div');
    els.loading.id = 'ibox_loading';
    els.loading.innerHTML = 'Loading...';
    els.loading.style.display = 'none';
    els.loading.onclick = _pub.hide
    els.container.appendChild(els.loading);

    els.wrapper = document.createElement('div')
    els.wrapper.id = 'ibox_wrapper';
    _pub.updateObject(els.wrapper.style, {position: 'absolute', top: 0, left: 0, display: 'none'});

    els.content = document.createElement('div');
    els.content.id = 'ibox_content';
    _pub.updateObject(els.content.style, {overflow: 'auto'})
    els.wrapper.appendChild(els.content);
  
    var child = document.createElement('div');
    child.id = 'ibox_footer_wrapper';
  
    var child2 = document.createElement('a');
    child2.innerHTML = _pub.close_label;
    child2.href = 'javascript:void(0)';
    child2.onclick = _pub.hide;
    child.appendChild(child2);
  
    els.footer = document.createElement('div');
    els.footer.id = 'ibox_footer';
    els.footer.innerHTML = '&nbsp;';
    child.appendChild(els.footer);
    els.wrapper.appendChild(child);

    els.container.appendChild(els.wrapper);

    elem.appendChild(els.container);
        
    _pub.updateObject(els.wrapper.style, {right: '', bottom: ''});
    
    return els.container;
  };
  
  /**
   * Hides tags within the container
   * @param {String} tag The name of the tag (e.g. 'a')
   * @param {HTMLObject} container The container to restore tags within (defaults to document)
   */
  var hideTags = function(tag, container) {
    if (container === undefined) var container = document.body;
    var list = container.getElementsByTagName(tag);
    for (var i=0; i<list.length; i++) {
      if (_pub.getStyle(list[i], 'visibility') != 'hidden' && list[i].style.display != 'none') {
        list[i].style.visibility = 'hidden';
        list[i].wasHidden = true;
      }
    }
  };
  
  /**
   * Shows all previously hidden tags in a container.
   * @param {String} tag The name of the tag (e.g. 'a')
   * @param {HTMLObject} container The container to restore tags within (defaults to document)
   */
  var showTags = function(tag, container) {
    if (container === undefined) var container = document.body;
    var list = container.getElementsByTagName(tag);
    for (var i=0; i<list.length; i++) {
      if (list[i].wasHidden) {
        list[i].style.visibility = 'visible';
        list[i].wasHidden = null;
      }
    }
  };
  
  var showInit = function(title, params, callback) {
    if (!_initialized) initialize();
    if (params === undefined) var params = {};
    if (active.plugin) _pub.hide();

    active.is_loaded = true;
    active.params = params;
    
    els.loading.style.display = "block";
    
    _pub.center(els.loading);
    _pub.reposition();

    // hide tags
    for (var i=0; i<_pub.tags_to_hide.length; i++) {
      hideTags(_pub.tags_to_hide[i]);
    }

    // set title here
    els.footer.innerHTML = title || "&nbsp;";

    // setup background
    els.overlay.style.display = "block";
    
    if (!_pub.is_firefox) var amount = 70;
    else var amount = 100;
    _pub.fade(els.overlay, _pub.getOpacity(null, els.overlay), amount, _pub.fade_in_speed, callback);
    
    _pub.fireEvent('show');
  };
  
  var drawCSS = function() {
    // Core CSS (positioning/etc)
    var core_styles = "#ibox {z-index:1000000;text-align:left;} #ibox_overlay {z-index:1000000;} #ibox_loading {position:absolute;z-index:1000001;} #ibox_wrapper {margin:30px;position:absolute;top:0;left:0;z-index:1000001;} #ibox_content {z-index:1000002;margin:27px 5px 5px 5px;padding:2px;} #ibox_content object {display:block;} #ibox_content .ibox_image {width:100%;height:100%;margin:0;padding:0;border:0;display:block;} #ibox_footer_wrapper a {float:right;display:block;outline:0;margin:0;padding:0;} #ibox_footer_wrapper {text-align:left;position:absolute;top:5px;right:5px;left:5px;white-space:nowrap;overflow:hidden;}";
    
    // Default style/theme/skin/whatever
    var default_skin = "#ibox_footer_wrapper {font-weight:bold;height:20px;line-height:20px;} #ibox_footer_wrapper a {text-decoration:none;background:#888;border:1px solid #666;line-height:16px;padding:0 5px;color:#333;font-weight:bold;font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10px;} #ibox_footer_wrapper a:hover {background-color:#bbb;color:#111;} #ibox_footer_wrapper {font-size:12px;font-family:Verdana, Arial, Helvetica, sans-serif;color:#111;} #ibox_wrapper {border:1px solid #ccc;} #ibox_wrapper {background-color:#999;}#ibox_content {background-color:#eee;border:1px solid #666;} #ibox_loading {padding:50px; background:#000;color:#fff;font-size:16px;font-weight:bold;}";

    var head = document.getElementsByTagName("head")[0];

    // tricky hack for IE
    // because IE doesn't like when you insert stuff the proper way
    // and we cant use relative paths to include this as an external
    // stylesheet
    var htmDiv = document.createElement('div');

    htmDiv.innerHTML = '<p>x</p><style type="text/css">'+default_skin+'</style>';
    head.insertBefore(htmDiv.childNodes[1], head.firstChild);

    htmDiv.innerHTML = '<p>x</p><style type="text/css">'+core_styles+'</style>';
    head.insertBefore(htmDiv.childNodes[1], head.firstChild);
  };

  var _initialized = false;
  var initialize = function() {
    // make sure we haven't already done this
    if (_initialized) return;
    _initialized = true;
    // elements here start the look up from the start non <a> tags
    drawCSS();
    create(document.body);
    _pub.checkTags(document.body, 'a');
    _pub.http = _pub.createXMLHttpRequest();
    _pub.fireEvent('load');
  };
  
  _pub.addEvent(window, 'keypress', function(e){ if (e.keyCode == (window.event ? 27 : e.DOM_VK_ESCAPE)) { iBox.hide(); }});
  _pub.addEvent(window, 'resize', _pub.reposition);
  _pub.addEvent(window, 'load', initialize);
  _pub.addEvent(window, 'scroll', _pub.reposition);

  // DEFAULT PLUGINS

  /**
   * Handles embedded containers in the page based on url of #container.
   * This _ONLY_ works with hidden containers.
   */
  var iBoxPlugin_Container = function() {
    var was_error = false;
    var original_wrapper = null;
    return {
      /**
       * Matches the url and returns true if it fits this plugin.
       */
      match: function(url) {
        return url.indexOf('#') != -1;
      },
      /**
       * Called when this plugin is unloaded.
       */
      unload: function() {
        if (was_error) return;
        var elemSrc = _pub.html().firstChild;
        if (elemSrc) {
          elemSrc.style.display = 'none';
          original_wrapper.appendChild(elemSrc);
        }
      },
      /**
       * Handles the output
       * @param {iBox} ibox
       * @param {String} url
       * @return {iBoxContent} an instance or subclass of iBoxContent
       */
      render: function(url, params) {
        was_error = false;
        var elemSrcId = url.substr(url.indexOf("#") + 1);
        var elemSrc = document.getElementById(elemSrcId);
        // If the element doesnt exist, break the switch
        if (!elemSrc) {
          was_error = true;
          _pub.html(document.createTextNode('There was an error loading the document.'), params);
        }
        else {
          original_wrapper = elemSrc.parentNode;
          elemSrc.style.display = 'block';
          _pub.html(elemSrc, params);
        }
      }
    }
  }();
  _pub.plugins.register(iBoxPlugin_Container, true);

  /**
   * Handles images
   */
  var iBoxPlugin_Image = function() {
    // Image types (for auto detection of image display)
    var image_types = /\.jpg|\.jpeg|\.png|\.gif/gi;

    return {
      match: function(url) {
        return url.match(image_types);
      },

      render: function(url, params) {  
        var img = document.createElement('img');
        img.onclick = _pub.hide;
        img.className = 'ibox_image'
        img.style.cursor = 'pointer';
        img.onload = function() {
          _pub.html(img, {width: this.width, height: this.height, constrain: true})
        }
        img.onerror = function() {
          _pub.html(document.createTextNode('There was an error loading the document.'), params);
        }
        img.src = url;
      }
    }
  }();
  _pub.plugins.register(iBoxPlugin_Image);

  var iBoxPlugin_YouTube = function() {
    var youtube_url = /(?:http:\/\/)?(?:www\d*\.)?(youtube\.(?:[a-z]+))\/(?:v\/|(?:watch(?:\.php)?)?\?(?:.+&)?v=)([^&]+).*/;
    return {
      match: function(url) {
        return url.match(youtube_url);
      },

      render: function(url, params) {
        var _match = url.match(youtube_url);
        var domain = _match[1];
        var id = _match[2];
        params.width = 425;
        params.height = 355;
        params.constrain = true;
        var html = '<object width="100%" height="100%" style="overflow: hidden; display: block;"><param name="movie" value="http://www.' + domain + '/v/' + id + '"/><param name="wmode" value="transparent"/><embed src="http://www.' + domain + '/v/' + id + '" type="application/x-shockwave-flash" wmode="transparent" width="100%" height="100%"></embed></object>';
        _pub.html(html, params);
      }
    }
  }();
  _pub.plugins.register(iBoxPlugin_YouTube);

  var iBoxPlugin_Document = function() {
    return {
      match: function(url) {
        return true;
      },

      render: function(url, params) {
        _pub.http.open('get', url, true);

        _pub.http.onreadystatechange = function() {
          if (_pub.http.readyState == 4) {
            // XXX: why does status return 0?
            if (_pub.http.status == 200 || _pub.http.status == 0) {
              _pub.html(_pub.http.responseText, params);
            }
            else {
              _pub.html(document.createTextNode('There was an error loading the document.'), params);
            }
          }
        }
        _pub.http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
        try {
          _pub.http.send(null);
        }
        catch (ex) {
          _pub.html(document.createTextNode('There was an error loading the document.'), params);
        }
      }
    };
  }();
  _pub.plugins.register(iBoxPlugin_Document, true);

  return _pub;
}();